Table 1. Weight loss, morbidity, mortality rate, and HI titers of domestic ducks exposed to 3 strains of H5N8 influenza virus*.
| Virus | Group | Illness† | Weight loss, %‡ | Deaths (%) | HI titer§ (log2, mean±SD) |
|---|---|---|---|---|---|
| A/breeder duck/Kr/Gochang1/2014 (H5N8) |
Inoculated | 3/5 | 32 | 1/5 (20) | 2/5 (5.5 ± 0.7) |
| Contact¶ |
2/3 |
21 |
0/3 |
1/3 (5) |
|
| A/broiler duck/Kr/Buan2/2014 (H5N8) |
Inoculated | 2/5 | 28 | 0/5 | 4/5 (7.5 ± 0.6) |
| Contact¶ |
1/3 |
26 |
0/3 |
1/3 (6) |
|
| A/Baikal teal/Kr/Donglim3/2014 (H5N8) |
Inoculated | 3/5 | 34 | 1/5 (20) | 3/5 (7.3) |
| Contact¶ |
2/3 |
28 |
0/3 |
0/3 |
|
| Controls (no virus exposure) | 0/3 | – | 0/3 | 0/3 |
*Unless indicated otherwise, data represent the number of affected animals/ animals in the group. Animals were inoculated by the intranasal route with 106.5 egg-infective dose50/0.1 mL of the selected viruses; HI, hemagglutination inhibition. †Severe depression, cloudy eye, and intermittent head-shaking. ‡Weight loss was measured at 11 d postinoculation and is expressed as a percentage of the weight of preinoculation ducks. §HI titer was assayed in serum samples taken at 14 d postinoculation. Data show the ratio of antibody-positive animals to the number of virus-inoculated animals. ¶Three uninoculated birds were co-housed with infected birds as a contact group 8 h after inoculation.